Bug 2544594

Summary: CVE-2026-103678 tnef: Heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed RTF MAPI value [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: tnefAssignee: Artur Frenszek-Iwicki <fedora>
Status: ASSIGNED --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: dtimms, fedora
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["5e69ddb8-bd03-4f9a-9cf3-1b497fe0c97f"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2544476    

Description Vladimir Vasilev 2026-10-01 11:37:25 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in tnef. The TNEF uncompressed-RTF value handler in get_rtf_data_from_buf() copies an attacker-controlled uncompr_size number of bytes from the input buffer without validating that the buffer actually contains that much data beyond the 16-byte value header, resulting in a heap out-of-bounds read. The issue was confirmed under AddressSanitizer and can crash the process; when body extraction (--save-body) is enabled, the over-read memory is written into the extracted RTF output file.